If anyone is in contact with Angela Woodford, they could ask her to put something on the Hertford OBs group on Facebook. I remember the name, but no details, I didn't learn German. I don't think she was at CH the whole time I was, I also remember the name Mrs Agulnik as a German teacher, we only had one at a time.

Katharine Dobson (Hills) 6.14, 1959 - 1965
Don't worry about the world coming to an end today. It's already tomorrow in Australia!

This link mentions and includes an email address for a Rosemary Selle.

Rosemary Anne Selle was the author whom acknowledged her first German teacher, Frau Friedel Nutto von Stetten, in her Author's Preface of 1981 referred to elsewhere in the thread.

It might be worth a speculative email to ascertain whether or not it is the same Rosemary Selle and, if so, whether she maintained contact with Frau Nutto von Stetten. The fact that she acknowledged her suggests to me that she may have done.